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D( n )
n*n = 0
n*n = 0
n*n = 0
1*n^2 = 0 // : 1
n^2 = 0
n = 0
n in (-oo:0) U (0:+oo)
36/(n*n) = 1/3 // - 1/3
36/(n*n)-(1/3) = 0
36/(n*n)-1/3 = 0
36*n^-2 = 1/3 // : 36
n^-2 = 1/108
-2 < 0
1/(n^2) = 1/108 // * n^2
1 = 1/108*n^2 // : 1/108
108 = n^2
n^2 = 108 // ^ 1/2
abs(n) = 6*3^(1/2)
n = 6*3^(1/2) or n = -(6*3^(1/2))
n in { 6*3^(1/2), -(6*3^(1/2)) }
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